| Latent obstruction (n = 54) | Non-obstructive (n = 33) | Significance | ||
| Peak left ventricular outflow tract gradient (mm Hg) | 89.1 (51.2) | 15.6 (6.0) | <0.001 | |
| Δ Gradient (mm Hg) | 75.0 (49.3) | 6.6 (6.3) | <0.001 | |
| Peak exercise systolic BP (mm Hg) | 167.6 (35.1) | 152.5 (28.4) | 0.04 | |
| Abnormal BP response on exercise | 12 (22.2%) | 12 (36.4%) | 0.2 | |
| Peak exercise VO2 (%) | 77.4 (19.5) | 67.1 (16.5) | 0.015 | |
| Peak exercise heart rate (%) | 85.0 (13.2) | 81.0 (13.6) | 0.2 | |
| Work (%) | 75.3 (23.2) | 65.5 (22.4) | 0.1 | |
| Respiratory quotient | 1.1 (0.1) | 1.1 (0.1) | 1.0 |
All values expressed as mean (SD); BP, blood pressure; peak left ventricular outflow tract gradient measured during exercise or recovery; peak VO2, measure of exercise capacity adjusted for age, gender and body size (expressed as %); peak exercise heart rate, % of target heart rate reached at peak exercise; work expressed as a percentage achieved/predicted (adjusted for age and body size) work in watts at peak exercise.